Prophylactic use of inulin against sinusitis

ABSTRACT

The present invention relates to an inulin composition comprising GFn- and Fm-compounds, in particular for decreasing the risk of sinusitis, preferably for use in the prophylaxis of sinusitis in a subject in need thereof and food, beverages and pharmaceutical compositions containing the inulin composition.

DESCRIPTION

Prophylactic Use of Inulin against Sinusitis

The present invention relates to an inulin composition comprising GF_(m)- and F_(m)-compounds, in particular for decreasing the risk of sinusitis, preferably for use in the prophylaxis of sinusitis in a subject in need thereof and food, beverages and pharmaceutical compositions containing the inulin composition.

The inflammation of the paranasal sinuses is commonly known as sinusitis or rhinosinusitis. Sinusitis commonly involves inflammation of the air cavities within the passages of the nose. It can be caused by viral or bacterial organism, allergy, particular irritation of the sinuses or autoimmune problems. Most cases are, however, due to viral infection. Generally, sinusitis is classified in various categories, namely acute sinusitis referring to new infections lasting up to four weeks, recurrent acute sinusitis involving four or more separate episodes of acute sinusitis occurring within one year, sub-acute sinusitis representing a transition between acute and chronic infections, chronic sinusitis showing signs and symptoms of sinusitis for more than 12 weeks and acute exacerbation of chronic rhinosinusitis showing signs and symptoms of chronic sinusitis exacerbate but returning back to baseline after treatment. The most common form of sinusitis is acute sinusitis caused by viral infections, in particular caused by rhinoviruses, coronaviruses and influenza viruses, but also by adenoviruses or other virus types. In fact, acute respiratory tract infections are the most common reason for people to seek medical help in developed countries.

Sinus infection symptoms usually include sinus headache, facial tenderness, pressure or pain in the sinuses, fever, cloudy, discolored drainage and sore throat and cough.

Sinus infection is generally diagnosed based on patient history and physical examination by a healthcare professional. Bacterial sinusitis is usually treated with an antibiotics therapy. In high-income countries, acute upper respiratory tract infections account for up to 75% of all antibiotic use. Viral sinusitis usually resolves without antibiotics and commonly involves the use of home remedies such as over-the-counter medications and an appropriate patient's behavior such as resting and drinking enough water. The incidence of viral respiratory tract infections in children is about 6 to 8 per year.

However, the development of effective preventive strategies is needed both globally and at the national level to reduce the incidence of acute respiratory infections, in particular also in children.

The prevention of sinusitis is known in the art and involves mainly behavioral instructions to subjects in danger of sinusitis. Thus, such subjects should avoid any contact with people who have colds and other viral upper respiratory infections, should avoid cigarettes, cigar and pipe smoke and treat stuffiness caused by colds or allergies promptly helping to prevent a bacterial infection from developing in the sinuses. Further, strategies to prevent acute infections include the administration of different immune-stimulants, vitamins, and trace elements; recently, probiotics also were described to be effective in reducing the incidence of upper respiratory tract infections and diarrhea.

With probiotic supplementation, a large number (billions) of living probiotic bacteria must be administered on a daily basis to ensure the continuous colonization of the intestine and achieve the desired health benefits.

Supplementation with prebiotics may be an alternative and easier way to achieve the same positive health effects usually ascribed to supplementation with probiotics. Prebiotics mimic the beneficial functional properties of human milk oligosaccharides (HMOs): they increase stool colony counts of bifidobacteria and lactobacilli (Lohner et al., Nutrition Reviews, Special Article, vol. 72, issue 8, 2014, 523-531).

As for the mechanism responsible for the beneficial role of prebiotics studies in infants have documented that prebiotic mixture supports immune development by significantly improving the intestinal microbiota. A healthy microbiota in turn is important for the development of the immune system (Chatchatee et al., J Pediatr Gastroenterol Nutr., 58(4), 2014, 428-437). Supplementation of 0-2 year old infants and children with prebiotics accordingly led to fewer upper respiratory tract infections (Arslanoglu et al., The Journal of Nutrition, 2008, 1091-1095).

Even though the intestinal microbiota can still be modified by prebiotic intake in children beyond the age of 2 (Lien et al., Asia Pac J Clin Nutr, 18(3), 2009, 326-334), no effects on upper respiratory tract infections or fever are obtained in older children (up to 10 years) (Perez et al., Eur J Nutr, vol. 49, 2010, 173-179).

As evident from the tremendous amount of sinusitis cases all over the world occurring each year and the above-identified efforts to prevent or treat sinusitis in patients of any age, it is apparent that the existing prophylactic means are not sufficient to prevent the occurrence of sinusitis, both in adults and children.

Thus, the technical problem underlying the present invention is to provide improved means for decreasing the risk of sinusitis in subjects in need thereof, in particular for use in the prophylaxis of sinusitis in subjects in need thereof.

A particular technical problem underlying the present invention is to provide improved means for decreasing the risk of sinusitis in subjects in need thereof, in particular for use in the prophylaxis of sinusitis in subjects in need thereof, wherein the subjects in need thereof are children, in particular at an age from three to six.

The technical problem underlying the present invention is solved by the teaching according to the claims, in particular by an inulin composition comprising GF_(n)- and F_(m)-compounds, which inulin composition comprises 25 to 40 wt.-% (dry substance, based on total mass of carbohydrates) of compounds having a DP (degree of polymerization) ≥11, 15 to 30 wt.-% (dry substance, based on total mass of carbohydrates) of F_(m) compounds with m=2 to 9, wherein the DP_(AV) (number-average degree of polymerization) of the inulin composition is 6.5 to 9.

It was surprisingly found that such an inulin composition can be safely used for decreasing the risk of sinusitis in subjects in need thereof, particularly humans, preferably in children at an age from 3 to 6, thereby significantly reducing the occurrence of sinusitis. Thus, the present inulin composition is useful for the prophylactic treatment in humans.

In a particularly preferred embodiment, the subject in need for decreasing the risk of sinusitis or of a prophylaxis of sinusitis is a human at an age of at least 3 years, in particular a preschool human, in particular a human at an age from 3 to 6 years, preferably 3.5 to 6 years, preferably 4 to 6 years, preferably 5 to 6 years, preferably 5 to 5.5 years.

Thus, the present invention in particular relates to an inulin composition according to the present teaching which is for use in the prophylaxis of sinusitis in a subject in need thereof. In a preferred embodiment, the present invention relates to an inulin composition according to the present teaching which is for decreasing the risk of sinusitis in a subject in need thereof. In a preferred embodiment, the present invention relates to an inulin composition according to the present teaching which is for use in a method of decreasing the risk of sinusitis in a subject in need thereof.

The present invention provides the unexpected and advantageous teaching that the specific inulin composition of the present invention when used as an active ingredient in human beings, in particular human beings at an age of 3 to 6 years, significantly reduces the number of sinusitis cases compared to a placebo control group, preferably by at least 33%, particularly at least 35%, particularly at least 40%, particularly at least 45% and preferably at least 50%. Preferably, said significant reduction in comparison to a placebo control group is realized during an administration period of the present inulin composition of at least four weeks, preferably at least two months, preferably at least three months, preferably at least five months, preferably at least six months, preferably at least nine months and particularly at least one year. In a preferred embodiment, the placebo group is treated with maltodextrin as the placebo.

The inulin composition provided by the present invention not only significantly reduces the occurrence of sinusitis but also does not cause any significant gastrointestinal or other problems to the subject. In fact, the inulin composition of the present invention is safe and very well tolerated even after continuous administration for 6 months. It could preferably even be shown that the stool consistency was favorably modulated by the present mixture by making the stools softer within a healthy and normal range in the subjects investigated.

The present invention is, without being bound by theory, further surprising and advantageous insofar as it is known that the major period of maturation of the immune system in humans is the infantile age from birth to twelve months. Thus, the development of the immune system is regularly already completed at an age of at latest 3 years. However, the present composition is a preferred embodiment and is able to improve the performance of the immune system in children of an age from 3 to 6 years.

In the context of the present invention, the term ‘inulin’ refers to a polydisperse carbohydrate material comprising mainly fructose units connected by β(2-1)-fructosyl-fructose links. It is a white odorless soluble powder with a slightly sweet taste and no aftertaste.

In particular, inulin is a mixture of oligo- and polysaccharides which are composed of fructose (F) units and which oligo- and polysaccharides may or may not comprise a starting glucose moiety (G). Thus, in the context of the present invention, the term inulin refers to both GF_(n)—(which is Glucose-Fructose_(n) or Glu-Fru_(n)) and F_(m)—(which is Fructose_(m), or Fru_(m)) compounds, with n and m: number of fructose units in the oligo- or polysaccharide and each of n and m>2.

In a particularly preferred embodiment of the present invention, the inulin composition of the present invention is prepared from inulin of plant origin, i.e. originating and prepared from a plant, preferably said plant inulin having a DP (degree of polymerization) of at maximum 200. In a preferred embodiment, the present inulin composition is prepared from chicory inulin, preferably from native chicory inulin, preferably said chicory inulin having a DP from 2 to 70, and/or said chicory inulin preferably containing no or negligible amounts of compounds F_(m) with m≥10 (F10 and higher). However, an inulin composition prepared and originating from Dahlia, Jerusalem artichoke (Helianthus tuberosus), Inula helenium or other suitable plants is also envisaged.

In the context of the present invention, the term ‘sinusitis’ refers to acute sinusitis which is defined as inflammation of one or more of the paranasal sinuses and characterized by at least one of the following prominent symptoms and signs lasting for less than 4 weeks, namely nasal congestion, purulent rhinorrhea, facial-dental pain, postnasal drainage, headache, cough, sinus tenderness on palpation, mucosal erythema, purulent nasal secretion, increased pharyngeal secretion and periorbital edema (Slavin et al., J Allergy Clin Immunol, vol. 116(6), 2005, S13-S47).

In the context of the present invention, the term ‘prophylaxis’ refers to a treatment designed and used to prevent the disease, namely sinusitis, from occurring.

In a preferred embodiment of the present invention, the inulin composition according to the present teaching comprises 30 to 38 wt.-%, preferably 35 to 39 wt.-%, preferably 32 to 38 wt.-%. preferably 32 to 36 wt.-% (each based on dry matter and on total mass of carbohydrates) of compounds, preferably GF_(n)-compounds, having a DP≥11.

In a furthermore preferred embodiment of the present invention, the inulin composition according to the present teaching comprises 20 to 28 wt.-%, preferably 22 to 26 wt.-% (each based on dry matter and based on total mass of carbohydrates) of F_(m)-compounds with m=2 to 9.

In a furthermore preferred embodiment of the present invention, the inulin composition according to the present teaching has a DP_(AV) from 7 to 8, preferably 7.5.

In a preferred embodiment of the present invention, the inulin composition comprises, preferably consists essentially of, preferably consists of, GF_(n)- and F_(m)-compounds. Preferably, the inulin composition of the present invention contains less than 1 wt.-% of F_(m)-compounds with m≥10 (DP≥10), preferably does not contain F_(m)-compounds with m≥10.

The inulin composition of the present invention preferably comprises 50 to 70 wt.-%, preferably 55 to 65 wt.-%, GF_(n)- and F_(m)-compounds with a DP 3 to 10. In a furthermore preferred embodiment of the present invention, the present inulin composition comprises 30 to 40 wt.-%, preferably 32 to 36 wt.-%, preferably 35 to 39 wt.-%, preferably 32 to 38 wt.-% GF_(n)-compounds with a DP≥11 (each based on dry matter and on the total mass of carbohydrates, preferably measured by HPAEC-high performance anion exchange chromatography). Preferably, the present inulin composition comprises 50 to 70 wt.-%, preferably 55 to 65 wt.-%, GF_(n)- and F_(m)-compounds with a DP 3 to 10 and 30 to 40 wt.-%, preferably 32 to 36 wt.-%, preferably 35 to 39 wt.-%, preferably 32 to 38 wt.-%, GF_(n)-compounds with a DP≥11 (each based on dry matter and on total mass of carbohydrates, preferably each measured by HPAEC).

In a preferred embodiment of the present invention, the inulin composition comprises, preferably essentially consists of, preferably consists of, 80 to 100%, preferably 80 to 99%, preferably 82 to 98%, preferably 85 to 95%, preferably 87 to 92%, GF_(n)- and F_(m)-compounds, and 0 to 20%, preferably 1 to 20%, preferably 2 to 18%, preferably 5 to 15%, preferably 8 to 13%, monosaccharides and sucrose (each based on weight of dry matter and total mass of carbohydrates). Most preferably, the inulin composition comprises 86 to 89 wt.-% GF_(n)- and F_(m)-compounds and 11 to 14 wt.-% glucose, fructose and sucrose (each based on weight of dry matter and total mass of carbohydrates).

In the context of the present invention, a monosaccharide is preferably glucose, fructose or a mixture thereof.

In a preferred embodiment of the present invention, the present inulin composition does not contain galactose and/or oligosaccharides or polysaccharides, which oligo- or polysaccharides contain at least one galactose moiety.

In a preferred embodiment of the present invention, the inulin composition of the present invention comprises at least 80%, preferably at least 85%, preferably at least 86%, preferably at least 90%, GF_(n)- and F_(m)-compounds and the remainder adding up to 100% with sucrose and/or monosaccharides, preferably glucose, fructose, sucrose or a mixture thereof (each based on weight of dry matter and total mass of carbohydrates).

In one preferred embodiment of the present invention, the present inulin composition is free of sucrose and/or monosaccharides, preferably free of glucose, fructose, sucrose or a mixture thereof.

In a furthermore preferred embodiment of the present invention, the present inulin composition is adapted and suitable for use in a dosage from 2.5 to 15 g/day, in particular 3.0 to 14 g/day, in particular 7 to 12 g/day, in particular 5 to 10 g/day, preferably 8 to 10 g/day, preferably 5 to 7 g/day, preferably 6 g/day, in particular for children.

In a furthermore preferred embodiment, the present inulin composition is adapted and suitable for use in a dosage form from 5.0 to 15 g/day, in particular 7 to 12 g/day, in particular 8 to 10 g/day, in particular for adults. Preferably, a dosage from 5 to 7 g/day, in particular 6 g/day, is provided for adults.

The present inulin composition may be in solid, for instance dry, semi-solid or liquid form, for instance in form of an aqueous solution or suspension.

In a preferred embodiment of the present invention, the present inulin composition is for use over an administration period from 1 month to a lifetime administration, in particular from 2 months to 2 years, preferably from 3 months to 12 months, preferably from 1 month to 8 months, preferably 4 months to 8 months, most preferably for at least 6 months or for 6 months.

According to a preferred embodiment of the present invention, the inulin composition can be used in form of a pharmaceutical composition, preferably in a dosage unit form, for instance in form of a tablet, pill, agglomerate or powder.

The present inulin composition may also be used as an ingredient of a nutrition, for instance daily nutrition.

In a preferred embodiment, the present inulin composition is used as an ingredient of food, beverage or a pharmaceutical composition.

The present invention, thus, also provides a nutritional composition, preferably food or beverage, and a pharmaceutical composition each comprising, preferably consisting essentially of, the inulin composition of the present invention, preferably together with at least one additive. In a particularly preferred embodiment of the present invention, the nutritional composition, preferably food or beverage or the pharmaceutical composition, is in solid, semi-solid or liquid form.

In a preferred embodiment, the nutritional composition is for decreasing the risk of sinusitis in a subject in need thereof, preferably is for use in the prophylaxis of sinusitis in a subject in need thereof. In a furthermore preferred embodiment, the pharmaceutical composition of the present invention is for decreasing the risk of sinusitis in a subject in need thereof, preferably for use in the prophylaxis of sinusitis in a subject in need thereof.

In a particularly preferred embodiment of the present invention, the present inulin composition is orally administered to the subject in need thereof, in particular in form of a nutritional composition, preferably food or beverage or as a pharmaceutical composition.

In a particularly preferred embodiment of the present invention, the nutritional composition, preferably food or beverage, or the pharmaceutical composition comprises 1 to 99%, preferably 5 to 95%, preferably 10 to 90%, preferably 20 to 80%, preferably 30 to 70%, preferably 40 to 60%, preferably 50 to 90%, preferably 75 to 99%, preferably 60 to 95%, preferably 70 to 98%, of the present inulin composition and at least one additive in an amount adding up to 100% (% each in wt.-% based on overall weight of the composition). Such an additive may be a long-chain polyunsaturated fatty acid, a probiotic microorganism, a vitamin, a mineral, a sweetening agent such as a sugar substitute, high intensity sweetener or sugar, a binder, filler, lubricant, diluent, solvent, coloring agent, flavoring agent or plant extract.

In a preferred embodiment of the present invention, a method is provided to prophylactically treat a subject, in particular a human, in particular a human at an age of at least 3 years, preferably at an age from 3 to 6 years, so as to reduce the risk of sinusitis, in particular the occurrence of sinusitis, with the inulin composition of the present invention.

In the context of the present invention, the term ‘comprising’ preferably has the meaning of ‘containing’ or ‘including’, meaning that the composition in question at least comprises the specifically identified component without excluding the presence of further components. However, in a preferred embodiment, the term ‘comprising’ is also understood to have the meaning of ‘consisting essentially of’ and in a most preferred embodiment of ‘consisting’. The term ‘consisting essentially of’ excludes the presence of substantial amounts of further components except the specifically identified component of the composition. The term ‘consisting’ excludes the presence of any further compound, no matter in which quantity, in the composition identified.

In the context of the present invention, the term ‘comprising essentially’ preferably has the meaning that the specifically identified component is the component with the highest proportion in the composition in question compared to the other components present. However, in a preferred embodiment, the term ‘comprising essentially’ means that the composition in question comprises at least 50 wt.-%, even more preferably at least 51 wt.-%, preferably at least 60 wt.-%, most preferably at least 70 wt.-%, most preferably at least 80 wt.-%, most preferably at least 90 wt.-%, most preferably at least 95 wt.-%, most preferably at least 98 wt.-%, most preferably at least 99 wt.-%, of the specifically identified component.

If not outlined otherwise, percentage values given in the present description mean weight percent based on dry matter.

Section A: Determination of Weight Percentages

In the context of the present invention, the weight-% in dry matter of compounds having a DP≥11 based on the total mass of carbohydrates is determined by measuring the total amount of dry carbohydrates and the total amount of dry compounds having a DP up to and including 10 via high-temperature capillary gas chromatography (HGC) as disclosed in Joye & Hoebregs, J. AOAC International, vol. 83, no. 4, 2000, pages 1020 to 1025 and calculating from said measurements the weight-% of the sum of compounds having a DP≥11 and above.

In the context of the present invention, the weight-% in dry matter of F_(m)-compounds with m=2 to 9 based on the total mass of carbohydrates is determined by measuring the total amount of dry carbohydrates and the total amount of dry F_(m)-compounds with m=2 to 9 via high-temperature capillary gas chromatography (HGC) as disclosed in Joye & Hoebregs, J. AOAC International, vol. 83, no. 4, 2000, pages 1020 to 1025. Thus, F_(m)-compounds with m=2 to 9 include compounds F2, F3, F4, F5, F6, F7, F8 and F9, but e.g. no GF-compounds such as GF₂, (kestose) GF₃, and so on.

Section B: Determination of DP values:

In the context of the present invention, the term ‘DP’ (degree of polymerization) represents the inulin chain length expressed in number of glucose and fructose units present in the inulin molecule, i.e. the oligo- or polysaccharide.

In the context of the present invention, the number-average degree of polymerization (DP_(AV)) represents the average inulin chain length.

In the context of the present invention, the DP_(AV) for the present inulin composition comprising GF_(n) and F_(m)-compounds is calculated as follows.

The determination of the average degree of polymerization DP_(AV), i.e. the number-average degree of polymerization, in compositions consisting of GF_(n)-compounds according to AOAC Official Method 997.08 (2013 version, AOAC International) requires first the determination of free glucose and fructose concentrations, as well as the concentrations of glucose and fructose deriving from sucrose, starch and/or maltodextrines present in the inulin composition to be analyzed in order to determine then the amounts of inulin-related fructose (which is fructose bound in an GF_(n)-inulin molecule) (F_(i)) and inulin-related glucose (which is glucose bound in an GF_(n)-inulin molecule) (G_(i)) both of these amounts being measured after inulinase treatments, i.e. complete enzymatic hydrolysis of the inulin composition to be analyzed. Thus, subtracting the concentrations of glucose and fructose being either present in free form or in form of sucrose, starch and/or maltodextrines from the overall fructose and glucose content determined after complete hydrolysis of the inulin composition to be analyzed provides the concentrations, in particular weight-percentages, of F_(i), and G_(i).

In addition to the above-identified glucose and fructose in free form and deriving from sucrose, maltodextrines and/or starch, the present inulin composition comprising GF_(n)- and F_(m)-compounds, however, contains significant amounts of oligo- and polyfructose (F_(m)-compounds) leading after complete enzymatic hydrolysis to fructose molecules, as well. The amount of fructose from said F_(m)-compounds, therefore, has to be also subtracted from F_(i) in order to obtain the desired and thereby corrected GF_(n)-inulin-related fructose content.

In the context of the present invention, weight-percentages of F_(i), and G_(i) are determined via the above-identified method AOAC 997.08 (version 2013). In the context of the present invention, weight-percentages of compounds F2, F3, F4, F5, F6, F7, F8 and F9 are determined via high-temperature capillary gas chromatography (HGC) as disclosed in Joye & Hoebregs, J. AOAC International, vol. 83, no. 4, 2000, pages 1020 to 1025.

In the context of the present invention, the DP_(AV) for an inulin composition according to the present invention is calculated by correcting the weight-% values obtained by using the AOAC 997.08 method (2013 version) for F_(i) and G_(i) by the weight-% values obtained from using HGC for the determination of the amount of F2 to F9 compounds.

Accordingly, the DP_(AV) of the inulin composition according to the present invention is calculated as follows:

-   -   [F_(i) according to AOAC] minus [sum of F_(m) compounds         according to HGC] yields [F_(i) attributable to GF_(n)].     -   [F_(i) attributable to GF_(n)] divided by [G_(i)]+1. yields the         DP_(av) for the GF_(n) portion of the present composition.     -   The determination of the amount of the individual F_(m)         compounds via HGC allows direct calculation of the DP_(av) for         the F_(m) portion of the present composition.     -   The two DP_(av) numbers are combined to yield an overall DP_(av)         of the mixture.

Further preferred embodiments of the present invention are the subject-matter of the subclaims.

The present invention will now be further illustrated by way of a non-limiting example and the accompanying figures.

The figure shows:

the number of sinusitis episodes in children being subjected to a prophylactic treatment with the inulin composition of the present invention (termed ‘prebiotic’) and a placebo.

EXAMPLE

A) A double-blind, parallel, randomized and placebo controlled study on the effect of a prebiotic inulin composition according to the invention was conducted in children of 3 to 6 years. The study was conducted at the Nutritional Research Unit, investigated whether an administration of said mixture helps to reduce the risk of sinusitis episodes. The children took part in this study with the consent and permission of their parents.

From a group of 270 randomized children 258 started the study while 219 completed it with a group of 39 children which has dropped out. The children were healthy children of 3 to 6 years of age and were attending daycare centers.

The children were allocated to two different groups, wherein the first group (130 subjects) was subjected to a six-month administration of 6 g/day of the inulin composition of the present invention and the second group (128 subjects) (placebo group) was subjected to a six-month administration of 6 g/day of maltodextrin. The data were collected on five different study days (SD1 to SD5).

The prebiotic inulin composition and placebo were mixed into food and drinks consumed at a fixed time point each day (e.g. for breakfast or dinner).

The study design is depicted below.

To detect differences between the two supplemented groups the following statistical tests were used:

Shapiro-Wilk test for normal distribution,

Mann-Whitney test for quantitative variables, anthropometric measurements and incidence and duration of infectious diseases,

Pearson Chi-square test for variables expressed as percentages and for comparison of the proportion of children with specific acute disease incidences and antibiotic prescription rates.

Statistical tests were performed two-sided. A p-value of less than 5% was considered as statistically significant.

The data as presented herein were obtained on 5 different study days (SD 1-5) as evident from the above study design.

B) The prebiotic inulin composition as used in the study had 27 wt.% of compounds having DP≥11, 26 wt.% of F_(m) compounds (with m being 2 to 9), and a DP_(av) of 7.5. These characteristics were determined as described above in sections A and B. The prebiotic inulin composition was prepared by mixing 93% highly soluble inulin (Orafti® HSI, supplier: BENEO) with 7% long-chain inulin (Orafti® HP, supplier: BENEO).

C) The figure compares the prevalence of sinusitis episodes in the group of children having obtained the present inulin composition and the placebo group. Accordingly, there is a significant reduction in the sinusitis prevalence by 77% in the groups of children having obtained the inulin composition of the present invention. The present study, therefore, shows that the number of sinusitis episodes (figure) could drastically be reduced by intake of the inulin composition of the present invention.

The present study conducted in 3 to 6-year-old children, thus, shows the modulation of the health status of children with respect to the reduction of sinusitis even though the development of the immune system should have been almost completed at said age. The major period of maturation of the immune system is the infantile age, namely 0 to 12 months. Hence, the prebiotic inulin composition of the present invention is able to improve the performance of the immune system in children of preschool age, which is a novel and advantageous finding. The present study is the first study showing a significant reduction of sinusitis episodes in children, in particular aged 3 to 6 years.

Summing up, the present study shows that the present inulin composition is effective in the modulation of sinusitis over a vulnerable seasonal period in highly exposed study population, namely children attending daycare facilities aged 3 to 6 years. 

1. An inulin composition comprising GF_(n)- and F_(m)-compounds which composition comprises 25 to 40 wt.-% (dry matter, based on total mass of carbohydrates) of compounds having a DP≥11 (degree of polymerization), 15 to 30 wt.-% (dry matter, based on total mass of carbohydrates) of F_(m) compounds with m=2 to 9, wherein the DP_(Av) (average degree of polymerization) of the inulin composition is 6.5 to
 9. 2. The inulin composition according to claim 1 for decreasing the risk of sinusitis in a subject in need thereof.
 3. The inulin composition according to claim 2, wherein the risk of sinusitis is decreased by at least 33% in a group of subjects in need thereof compared to a group of placebo-treated subjects.
 4. The inulin composition according to claim 1 for use in the prophylaxis of sinusitis in a subject in need thereof.
 5. The inulin composition according to claim 2, wherein the subject in need thereof is a human at an age of at least three years.
 6. The inulin composition according to claim 5, wherein the subject in need thereof is a human at an age from three to six years.
 7. The inulin composition according to claim 1, which comprises 30 to 38 wt.-% (dry matter, based on total mass of carbohydrates) of compounds having a DP≥11.
 8. The inulin composition according to claim 1, which comprises 20 to 28 wt.-% (dry matter, based on total mass of carbohydrates) of F_(m) compounds with m=2 to
 9. 9. The inulin composition according to claim 1, wherein the DP_(Av) is 7 to
 8. 10. The inulin composition according to claim 1, comprising 50 to 70 wt.-% GF_(n)- and F_(m)-compounds with a DP 3 to 10 and 30 to 40 wt.-% GF_(n)-compounds with a DP≥11 (each based on dry matter and on total mass of carbohydrates).
 11. The inulin composition according to claim 1, comprising 80 to 99 wt.-% GF_(n)- and F_(m)-compounds and 1 to 20 wt.-% monosaccharides and sucrose (each based on weight of dry matter and total mass of carbohydrates).
 12. The inulin composition according to claim 1, wherein the composition is for use in a dosage from 5 to 15 g/per day for adults.
 13. The inulin composition according to claim 1, wherein the composition is for use in a dosage from 2.5 to 15 g/per day for children.
 14. The inulin composition according to claim 1, wherein the composition is for use over an administration period from 1 to 8 months.
 15. A food, beverage or pharmaceutical composition comprising the inulin composition according to claim
 1. 16. The inulin composition according to claim 4, wherein the subject in need thereof is a human at an age of at least three years.
 17. The inulin composition according to claim 16, wherein the subject in need thereof is a human at an age from three to six years.
 18. The inulin composition according claim 10, comprising 55 to 65 wt.-%, GF_(n)- and F_(m) compounds with a DP 3 to 10 and 35 to 39 wt.-%, GF_(n)-compounds with a DP≥11. 